SB2018030818 - Fedora EPEL 6 update for tor

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Main Vulnerability Database SB2018030818

SB2018030818 - Fedora EPEL 6 update for tor

Published: March 8, 2018 Updated: April 24, 2025

Security Bulletin ID SB2018030818
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) NULL pointer dereference (CVE-ID: CVE-2018-0490)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the directory-authority protocol-list subprotocol implementation due to NULL pointer dereference. A remote attacker can cause the service to crash via a misformatted relay descriptor that is mishandled during voting.

2) Use-after-free (CVE-ID: CVE-2018-0491)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green


The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10. It allows remote attackers to cause a denial of service (relay crash) because the KIST implementation allows a channel to be added more than once in the pending list.


Remediation

Install update from vendor's website.

References